From a108ed43da5b9f9a075ec87011fa89c401339baa Mon Sep 17 00:00:00 2001
From: "Vassiliy.Kudryashov" <Vassiliy.Kudryashov@jetbrains.com>
Date: Fri, 26 Dec 2014 16:27:08 +0300
Subject: [PATCH] antialiasing for wave underscore

---
 .../intellij/ui/SimpleColoredComponent.java   | 29 ++++++++++++++-----
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/platform/platform-api/src/com/intellij/ui/SimpleColoredComponent.java b/platform/platform-api/src/com/intellij/ui/SimpleColoredComponent.java
index 658e08676729..2e24a9f70e01 100644
--- a/platform/platform-api/src/com/intellij/ui/SimpleColoredComponent.java
+++ b/platform/platform-api/src/com/intellij/ui/SimpleColoredComponent.java
@@ -19,8 +19,10 @@ import com.intellij.ide.BrowserUtil;
 import com.intellij.openapi.application.Application;
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.ui.GraphicsConfig;
 import com.intellij.openapi.util.SystemInfo;
 import com.intellij.openapi.util.text.StringUtil;
+import com.intellij.util.ui.GraphicsUtil;
 import com.intellij.util.ui.JBInsets;
 import com.intellij.util.ui.JBUI;
 import com.intellij.util.ui.UIUtil;
@@ -37,6 +39,8 @@ import javax.swing.*;
 import javax.swing.border.Border;
 import javax.swing.tree.TreeCellRenderer;
 import java.awt.*;
+import java.awt.geom.GeneralPath;
+import java.awt.geom.PathIterator;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
@@ -682,13 +686,24 @@ public class SimpleColoredComponent extends JComponent implements Accessible, Co
       }
       // 2. Waved effect
       if (attributes.isWaved()) {
-        if (attributes.getWaveColor() != null) {
-          g.setColor(attributes.getWaveColor());
-        }
-        final int wavedAt = textBaseline + 1;
-        for (int x = offset; x <= offset + fragmentWidth; x += 4) {
-          UIUtil.drawLine(g, x, wavedAt, x + 2, wavedAt + 2);
-          UIUtil.drawLine(g, x + 3, wavedAt + 1, x + 4, wavedAt);
+        GraphicsConfig config = GraphicsUtil.setupAAPainting(g);
+        Stroke oldStroke = g.getStroke();
+        try {
+          g.setStroke(new BasicStroke(.7F));
+          if (attributes.getWaveColor() != null) {
+            g.setColor(attributes.getWaveColor());
+          }
+          final int wavedAt = textBaseline + 1;
+          GeneralPath wavePath = new GeneralPath(PathIterator.WIND_EVEN_ODD);
+          wavePath.moveTo(offset, wavedAt);
+          for (int x = offset; x <= offset + fragmentWidth; x += 4) {
+            wavePath.lineTo(x + 2, wavedAt + 2);
+            wavePath.lineTo(x + 4, wavedAt);
+          }
+          g.draw(wavePath);
+        } finally {
+          config.restore();
+          g.setStroke(oldStroke);
         }
       }
       // 3. Underline